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The John Ray Initiative

Chaired by Sir John Houghton, former Chair of the IPCC.

Evangelical Climate Initiative

Originators of the "What Would Jesus Drive?" Campaign

Evangelical Environmental Network

Publishers of Creation Care Magazine.

Evangelical Climate Initiative

Originators of the "What Would Jesus Drive?" Campaign

Greenpeace

Greenpeace is a media-savvy advocacy group historically focused on environmental, anti-nuclear, and energy issues. It has both a U.S.-based and a worldwide organization. They specialize in direct-action and investigative research. Wikipedia.

Climate Action Network

CAN is actually a coalition of over 365 NGOs worldwide pushing for action on climate change. They follow international climate treaty negotiations closely. Press Contact.

Natural Resources Defense Council

NRDC is a litigation- and science-oriented national environmental group with a membership of 1.2 million. Wikipedia. Press Contact.

Climate Institute

The Climate Institute, founded in 1986, is possibly the oldest single-issue group focused on climate change. Its style is more informational than advocacy-driven, and large conferences and symposia are characteristic activities.

Pew Center

The Pew Center on Global Climate Change is supported by the Pew Charitable Trusts, which is ultimately based on the family fortunes of the descendants of the founder of the Sun Oil Co. The Pew climate program is a centrist, non-profit advocacy organization "working to create a policy environment that leads to the adoption of mandatory federal limits on emissions that contribute to global warming." Pew works intensely with Fortune 500 companies.

Sierra Club

Sierra is perhaps the largest and most politically active of U.S. membership-based environmental groups. Their long-established climate change program is focused on grass-roots organizing and policy advocacy. Wikipedia. Press Contact.

United Nations Environment Programme

UNEP is the administrative umbrella for most major UN environmental efforts, including those on climate change. Their site is a good place to look for current and upcoming events, reports, and documents.